Improvement in harrows



A; JACOBSON.

Improvement in Revolving Harrows.

No, 125,395, Patented April 9, 1872.

lower end.

UNITED STATES PATENT @FFICE.

ANDREW JACOBSON, OF LOGAN, NEBRASKA.

IMPROVEMENT lN HARROWS.

Specification forming part of Letters Patent No. 125,395, dated April 9,1872.

Specification describing certain Improvements in Rotating Harrowsinvented by AN- DREW JAGOBsON, of Logan, in the county of Dodge andState of Nebraska.

This invention relates to that class of harrows which are caused torotate as they are drawn over the field; and it consists in theconstruction, combination, and arrangement of some of its parts, as willbe more fully explained hereinafter.

Figure l is a plan view of my improved harrow, showing the frame, thecenter-plate, the

draw-bar, the counter-weight, and the arm upon which it is adjusted.Fig. 2 is a central vertical section, showing the arrangement of theparts. Fig. 3 is a bottom view, showing a portion of a square frame withthe centerplate attached to it,- and showing also the construction ofthe plate that is to be followed when it is desirable to construct acircular frame.

Corresponding letters refer to correspondin g parts in all the figures.

In constructing implements of this character any suitable style of framemay be used, which may be of the square form shown in the drawing, or itmay be circular in form; in either case it is to be provided with therequisite number of teeth to properly pulverize the earth, and to givethe rotating motion to the frame. Upon the upper surface of the frame,when a square one is used, there is placed a plate of metal, which hasupon its upper surface a raised track for the wheel D to run upon. Theunder surface of this plate, at its center, is provided with studs orpins, which project downward a distance equal to the thickness of thetimbers composing the frame, they having upon their lower ends a plateof metahwhioh, together with the pins and the upper plate, form socketsfor the inner ends of the arms which compose the frame when a circularone is used; the outer ends of such arms being held betweendownwardly-projecting flanges upon the center-plate B, to which they aresecured by bolts. The draw-bar O is pivoted to the center-plate, at thecenter thereof, by means of a stud which passes down through it, and isheld by means of a nut upon its This bar is provided at its outer endwith a clevis to which to attach the dragchain, and, at its oppositeend, with a roller,

which runs upon the upper surface of the center-plate 13. Between itspivotal point and its outer or forward end there is placed anotherroller, which turns in an adj ustable frame, it being so arranged as tobear against the periphery of the center-plate,and thus form a supportfor the draw-bar at that point. Near the pivotal point of this bar thereis attached a yoke, one end of which forms a bearing for the upper endof the stud, upon which the lever turns, and it is also provided withsegmental projections upon its sides, which engage with shouldersuponthe arm which carries the adjustable weight, soon to be described,when it is turned from one side of the harrow to the other. To providefor carrying the adjustable weight an arm, D, is pivoted to the studwhich passes through the center-plate, the upper surface of which, atits inner end, is provided with projections which extend upward farenough to engage the yoke upon the draw-bar O, and thus hold it inposition upon either side of the harrow. This arm extends outward fromits point of connection with the draw-bar far enough to receive upon itsouter end a roller, D, which has a groove in its periphery to enable itto run upon the raised track upon the upper surface of the centerplate.Just inside of the roller D there is fastened to the arm D a stud, whichrises vertically and has its upper end provided with a socket for thereception of the lever D as shown in Fig. 2. Upon the lever D there isplaced an adjustable weight, D it being so arranged upon said lever thatit may be slid inward or outward at pleasure, and thus cause a greateror less amount of weight to be thrown upon the side of the harrow towardwhich the levei points, the object being to insure the. constantrotation of the frame of the harrow while in use, by causing the teethupon one of its sides to penetrate the earth to a. greater depth thanthose upon its opposite side, and thus cause them to offer a greaterresistance to the onward movement of the harrow.

One great advantage due to the adjustable weight consists in the factthat it maybe turned from one side to the other, which enables theoperator to use it upon hill sides,

and still-have it move in a straight line, which can always be done byplacing the weight upon the lower or descending side of the harrow.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The center-plate B, when constructed with projections upon its undersurface for the reception of the arms of a harrow, and a raised trackupon its upper surface for the roller which supports the Weighted leverto run upon, in combination with draft-bar O and rollers 0 G and Dsubstantially as and for the purpose set forth.

In testimony whereof I have signed myname to this specification in thepresence of two subscribing witnesses.

ANDREW J AOOBSON.

Witnesses:

W. O. llIUTTON WILLIAM CORSON.

